Whoa!! Big baby! Mine were both 8 1/2 lbs and I'm only 4'11 ..can't imagine how miserable you must have been! ha..
As for the sleeping question.. both mine did things like this. I tried rice cereal, I tried schedules, but nothing seemed to work. After a while, they seemed to just grow out of it.
You might try cutting back on the cereal though.. at 8 weeks, his tummy is tiny tiny, and he probably can't handle the cereal yet. He might not be sleeping well because of that after his 3am feeding.
Just try cutting it out for a few nights--whats the harm--its not like the cereal is working anyway..
Well, best of luck to you!
When my son was born and I was sleep deprived and miserable.. my mother told me that she was sure it would get better.. and that just before I get to the breaking point, where i am so tired I can't go on, the baby would start sleeping longer.
sure enough.. she was right.. this stage doesn't last forever!